北沟林场天然次生林主要乔木树种种间关系分析

Interspecific Relationships of Main Tree Species in a Natural Secondary Forest in Beigou Forest Farm,Hebei Province

采用χ2检验、Ochiai关联指数、Pearson相关分析和Spearman秩相关分析法对北沟林场天然次生林11种乔木的种间联结和相关性进行了研究,结果表明:所有种对中,呈显著相关和极显著相关的种对数所占比例较少,多数种对间关联程度未达到显著水平,说明林场多数乔木树种间关系不紧密,未形成明显的总体联结性,群落处于相对稳定状态;种间关系分析中,Spearman秩相关分析结果比χ2检验、Ochiai关联度和pearson相关分析的结果灵敏度要高;依照分析结果,结合植物种群的生物学和生态适应特征,将北沟林场天然次生林群落中11种乔木树种划分为3个生态种组,同一生态种组内物种资源利用方式和生态要求相似,联结紧密,而不同组间联结较为松散。

A study was performed to discuss the interspecific relationships among 11 main tree species in a natural secondary for- est in Beigou Forest Farm of Hebei Province by X2-test, Ochiai association index, Pearson＇ s correlation coefficient and Spearman＇ s rank correlation coefficient. Results showed that the proportion of species-pairs which had significant or highly significant correlation was less and the connection degree of most species-pairs did not reach a level of significance, indica- ting that the interspecific relationships between forest tree species were not so closely, and did not form a significant overal/ association, so the community was relatively stable. Compared withxZ-test, Ochiai association test and Pearson＇s correla- tion coefficient test, Spearman＇ s rank correlation coefficient test was more sensitive. The main tree species in the natural secondary forest were divided into three ecological species groups according to the analysis results and combined with the plant population biology and ecological adaptations. The resource use patterns and ecological requirements of tree species within the same ecological species group are similar, exhibiting a close connection between those tree species; however, there is a loose coupling between different ecological species groups.